Solid-state lighting using light-emitting diodes (LEDs) has the potential to reduce energy consumption for lighting by 50% while revolutionizing the way we illuminate our homes, work places, and public spaces. Nevertheless, substantial technical challenges remain in order for solid-state lighting to significantly displace the well-developed conventional lighting technologies. We review the potential of LED solid-state lighting to meet the long-term cost goals.
Surface scattering of Si to enhanced absorption particularly in the IR spectral region has been extensively investigated. Previous research chiefly examined approaches based on geometrical optics. These surface textures typically consist of pyramids with dimensions much larger than optical wavelengths. We have investigated a physical optics approach that relies on surface texture features comparable to, or smaller than, the optical wavelengths inside the semiconductor material. Light interaction at this are strongly dependent on incident polarization and surface profile. Nanoscale textures can be tuned for either narrow band, or broad band absorptive behavior. Lowest broad band reflection has been observed for triangular profiles with linewidths significantly less than 100 nm. Si nanostructures have been integrated into large (approximately 42 cm2) area solar cells. Internal quantum efficiency measurements in comparison with polished and conventionally textured cells show lower efficiency in the UV-visible (350 - 680 nm), but significantly higher IR (700 - 1200 nm) efficiency.
Conference Committee Involvement (4)
Light-Emitting Diodes: Research, Manufacturing, and Applications X
25 January 2006 | San Jose, California, United States
Light-Emitting Diodes: Research, Manufacturing, and Applications IX
25 January 2005 | San Jose, California, United States
Light-Emitting Diodes: Research, Manufacturing, and Applications VIII
27 January 2004 | San Jose, CA, United States
Third International Conference on Solid State Lighting
5 August 2003 | San Diego, California, United States
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